Ferdinand deming



' (No Model.)

I. DEMING. STRIPPING DEVICE.

No. 560,480. Patented May 19, 1896.

UNITED STATES PATENT OFFICE.

FERDINAND DEMIN G, OF WVATERBURY, CONNECTICUT, ASS IGNOR TO RANDOLPH &CLOWES, OF SAME PLACE.

STRI PPING DEVICE.

SPECIFICATION forming part of Letters Patent No. 560,480, dated May 19,1896. Application filed December 24,1895. Serial No. 573,229. (Nomodel.)

To all whom it may concern.-

Be it known that I, FERDINAND DEMING, of Waterbury, in the county of NewHaven and State of Connecticut, have invented a new and usefulImprovement in Stripping Devices; and I do hereby declare the following,when taken in connection with the accompanying drawings and the figuresof reference marked thereon, to be a full, clear, and exact descriptionof the same, and which said drawings constitute part of thisspecification, and represent, in

Figure 1, a side elevation, partly in section, of the stripper inconnection with the punch and cross-head; Fig. 2, a side elevation ofthe stripper complete.

My invention relates to that class of stripping devices which aredesigned to strip the tube from the male die or punch of a drawbenchafter it has been drawn, and applies more especially to that class oftubes of large diameter whose walls are of thin metal and provided witha hole bored in their otherwise solid end. Before my invention the tubewas removed from the punch after being drawn through the female die byencircling the punch with strippers, as shown by broken lines in Fig. 1and designated 10 10, which were circular in form and rested against therear face of the female die, the motion of the punch being reversed. Thetube was held in a fixed position by the action of the strippers anddie, while the punch continued its motion and was finally withdrawn.

It is my object to produce a device which is simple in structure and canbe easily applied, manufactured at a low cost, and which will strip thetube from the punch by means of an inside pressure rather than to forceit off by a pressure upon the ends of the walls of the tube, as doneheretofore. The tube in the process of drawing clings tightly to theunch re uirin great ressure to remove it and under the old method abovedescribed the tube was frequently destroyed by wrinkles and bucklesforming longitudinally in its wall, when the punch was withdrawn. Theseobjections are overcome in my device by removing the tube from the punchby the pressure being applied upon the inside of the end of the tube,thus distributing the strain much more equally than if the pressure wereapplied wholly upon the ends ofthe walls of the tube.

The punch 2 of a draw-bench is shown in Fig. 1 with the tube 1 upon it,occupying the relative positions which they occupy after the tube hasbeen drawn through the dies and is ready to be removed from the punch.The stripper-head 3, whose rear face is flat, is shaped to fit theinside of the tube and sets firmly against the end of the punch 2.Through the center of the stripper-head 3 is a tapped hole 4, whereby itmay besecured to the threaded rod or stripper-body 5. Rod 5 may be ofany convenient length and is threaded upon both ends, of which one isadapted to receive the head 3 and the other the nut 7. Head 3 and rod 5may be made of a single pieceof metal, as shown in Fig. 2, andpreferably so in some cases. The annular ring or washer 6, with the boresufficiently large to slide freely upon the rod 5, may be made of anysuitable form, provided it is larger than the slot 8 in the top of thecrosshead 9. Cross-head 9 is securely fastened to the floor or the baseof the machine by any of the common methods, and a slot 8, whose wallsare parallel to the axis of the punch, is cut through its upper portion,so that the rod 5 may lie therein. The stripper may be held by any meanswhich will retain it in a permanently-fixed position, and I do not,therefore, limit myself to the use of a cross-head, as shown herein.

The device is used in the following manner: Head 3 is placed in the tubeto be drawn before it is forced upon the punch 2. After the process ofdrawing, and when the tube is ready to be removed, the rod 5, havingupon one end the nut 7 and washer (5, is screwed into the tapped hole atin the head 3 and allowed to rest in the slot 8 of the cross-head 9. Themotion of the punch is now reversed, it moving in the direction of thearrow, and as the washer 6 is drawn up against the cross-head 9 the tubeis held stationary while the punch a is withdrawn.

It is obvious that there are many minor changes that can be made withinmy invention, and I would therefore have it understood that I do notlimit myself to the exact IOO 1. A stripper for removing tubes from thepunch or male die of a draw-bench which can be inserted in the tubebefore the process of drawing, with means for holding said stripper in afixed position after such drawing, thereby securing the tube in astationary position while the punch is being withdrawn substan- Ispecification in the presence of two subscril tially as hereinbefore setforth.

2. In a stripper adapted to be placed in the tube before the completionof the drawing thereof, the combination of a stripper-head and a rod orstripper-body, one end of said rod or stripper-body adapted to beattached to said stripper-head and the other to receive a nut andwasher, with means for securing said stripper in a fixed position duringthe operation of stripping, substantially as described.

3. In a stripper adapted to be placed in the tube before the completionof the drawing thereof, the combination of the head 3, rod 5, and nut 7on said rod, with means for securing said stripper in a fixed positionduring the operation of stripping substantially as described.

In testimony whereof I have signed this ing witnesses.

FERDINAND DEMING. Witnesses:

.T. BLACKNALL, Gno. H. CLowEs.

